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Date: Fri, 5 May 2023 12:37:25 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: ye.xingchen@....com.cn
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: socket: Use fdget() and fdput()
On Fri, May 5, 2023 at 11:06 AM <ye.xingchen@....com.cn> wrote:
>
> From: Ye Xingchen <ye.xingchen@....com.cn>
>
> By using the fdget function, the socket object, can be quickly obtained
> from the process's file descriptor table without the need to obtain the
> file descriptor first before passing it as a parameter to the fget
> function.
>
net-next is currently closed.
There are good reasons we have sockfd_lookup() and sockfd_lookup_light(),
you probably should take a deeper look at the difference between them.
> Signed-off-by: Ye Xingchen <ye.xingchen@....com.cn>
> ---
> net/socket.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/net/socket.c b/net/socket.c
> index a7b4b37d86df..84daba774432 100644
> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -528,19 +528,18 @@ EXPORT_SYMBOL(sock_from_file);
>
> struct socket *sockfd_lookup(int fd, int *err)
> {
> - struct file *file;
> + struct fd f = fdget(fd);
> struct socket *sock;
>
> - file = fget(fd);
> - if (!file) {
> + if (!f.file) {
> *err = -EBADF;
> return NULL;
> }
>
> - sock = sock_from_file(file);
> + sock = sock_from_file(f.file);
> if (!sock) {
> *err = -ENOTSOCK;
> - fput(file);
> + fdput(f);
> }
> return sock;
> }
> --
> 2.25.1
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